This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 $100 Million Term Loan Facility	Dec. 31, 2011 $100 Million Term Loan Facility	Aug. 12, 2010 $100 Million Term Loan Facility	Aug. 01, 2012 $100 Million Term Loan Facility August 2012 Agreements	Dec. 31, 2012 $253 Million Term Loan Facility	Dec. 31, 2011 $253 Million Term Loan Facility	Aug. 20, 2010 $253 Million Term Loan Facility	Aug. 01, 2012 $253 Million Term Loan Facility August 2012 Agreements	Dec. 31, 2012 Carrying Value	Dec. 31, 2011 Carrying Value	Dec. 31, 2012 Fair value	Dec. 31, 2011 Fair value
Fair value of financial instruments
Cash and cash equivalents											$ 72,600	$ 227,968	$ 72,600	$ 227,968
Restricted cash	10,150	9,750					9,750	9,750			10,150	9,750	10,150	9,750
Floating rate debt			75,484	90,869			180,793	221,393			1,413,439	1,588,012	1,413,439	1,588,012
2010 Notes											110,918	106,381	44,375	80,000
Face amount of term loan facility			$ 100,000	$ 100,000	$ 100,000	$ 100,000	$ 253,000	$ 253,000	$ 253,000	$ 253,000